/* * k5-platform.h * * Copyright 2003, 2004, 2005 Massachusetts Institute of Technology. * All Rights Reserved. * * Export of this software from the United States of America may * require a specific license from the United States Government. * It is the responsibility of any person or organization contemplating * export to obtain such a license before exporting. * * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and * distribute this software and its documentation for any purpose and * without fee is hereby granted, provided that the above copyright * notice appear in all copies and that both that copyright notice and * this permission notice appear in supporting documentation, and that * the name of M.I.T. not be used in advertising or publicity pertaining * to distribution of the software without specific, written prior * permission. Furthermore if you modify this software you must label * your software as modified software and not distribute it in such a * fashion that it might be confused with the original M.I.T. software. * M.I.T. makes no representations about the suitability of * this software for any purpose. It is provided "as is" without express * or implied warranty. * * * Some platform-dependent definitions to sync up the C support level. * Some to a C99-ish level, some related utility code. * * Currently: * + make "static inline" work * + 64-bit types and load/store code * + SIZE_MAX * + shared library init/fini hooks * + consistent getpwnam/getpwuid interfaces */ #ifndef K5_PLATFORM_H #define K5_PLATFORM_H #include "autoconf.h" /* Initialization and finalization function support for libraries. At top level, before the functions are defined or even declared: MAKE_INIT_FUNCTION(init_fn); MAKE_FINI_FUNCTION(fini_fn); Then: int init_fn(void) { ... } void fini_fn(void) { if (INITIALIZER_RAN(init_fn)) ... } In code, in the same file: err = CALL_INIT_FUNCTION(init_fn); To trigger or verify the initializer invocation from another file, a helper function must be created. This model handles both the load-time execution (Windows) and delayed execution (pthread_once) approaches, and should be able to guarantee in both cases that the init function is run once, in one thread, before other stuff in the library is done; furthermore, the finalization code should only run if the initialization code did. (Maybe I could've made the "if INITIALIZER_RAN" test implicit, via another function hidden in macros, but this is hairy enough already.) The init_fn and fini_fn names should be chosen such that any exported names staring with those names, and optionally followed by additional characters, fits in with any namespace constraints on the library in question. There's also PROGRAM_EXITING() currently always defined as zero. If there's some trivial way to find out if the fini function is being called because the program that the library is linked into is exiting, we can just skip all the work because the resources are about to be freed up anyways. Generally this is likely to be the same as distinguishing whether the library was loaded dynamically while the program was running, or loaded as part of program startup. On most platforms, I don't think we can distinguish these cases easily, and it's probably not worth expending any significant effort. (Note in particular that atexit() won't do, because if the library is explicitly loaded and unloaded, it would have to be able to deregister the atexit callback function. Also, the system limit on atexit callbacks may be small.) Implementation outline: Windows: MAKE_FINI_FUNCTION creates a symbol with a magic name that is sought at library build time, and code is added to invoke the function when the library is unloaded. MAKE_INIT_FUNCTION does likewise, but the function is invoked when the library is loaded, and an extra variable is declared to hold an error code and a "yes the initializer ran" flag. CALL_INIT_FUNCTION blows up if the flag isn't set, otherwise returns the error code. UNIX: MAKE_INIT_FUNCTION creates and initializes a variable with a name derived from the function name, containing a k5_once_t (pthread_once_t or int), an error code, and a pointer to the function. The function itself is declared static, but the associated variable has external linkage. CALL_INIT_FUNCTION ensures thath the function is called exactly once (pthread_once or just check the flag) and returns the stored error code (or the pthread_once error). (That's the basic idea. With some debugging assert() calls and such, it's a bit more complicated. And we also need to handle doing the pthread test at run time on systems where that works, so we use the k5_once_t stuff instead.) UNIX, with compiler support: MAKE_FINI_FUNCTION declares the function as a destructor, and the run time linker support or whatever will cause it to be invoked when the library is unloaded, the program ends, etc. UNIX, with linker support: MAKE_FINI_FUNCTION creates a symbol with a magic name that is sought at library build time, and linker options are used to mark it as a finalization function for the library. The symbol must be exported. UNIX, no library finalization support: The finalization function never runs, and we leak memory. Tough. DELAY_INITIALIZER will be defined by the configure script if we want to use k5_once instead of load-time initialization. That'll be the preferred method on most systems except Windows, where we have to initialize some mutexes. For maximum flexibility in defining the macros, the function name parameter should be a simple name, not even a macro defined as another name. The function should have a unique name, and should conform to whatever namespace is used by the library in question. (We do have export lists, but (1) they're not used for all platforms, and (2) they're not used for static libraries.) If the macro expansion needs the function to have been declared, it must include a declaration. If it is not necessary for the symbol name to be exported from the object file, the macro should declare it as "static". Hence the signature must exactly match "void foo(void)". (ANSI C allows a static declaration followed by a non-static one; the result is internal linkage.) The macro expansion has to come before the function, because gcc apparently won't act on "__attribute__((constructor))" if it comes after the function definition. This is going to be compiler- and environment-specific, and may require some support at library build time, and/or "asm" statements. But through macro expansion and auxiliary functions, we should be able to handle most things except #pragma. It's okay for this code to require that the library be built with the same compiler and compiler options throughout, but we shouldn't require that the library and application use the same compiler. For static libraries, we don't really care about cleanup too much, since it's all memory handling and mutex allocation which will all be cleaned up when the program exits. Thus, it's okay if gcc-built static libraries don't play nicely with cc-built executables when it comes to static constructors, just as long as it doesn't cause linking to fail. For dynamic libraries on UNIX, we'll use pthread_once-type support to do delayed initialization, so if finalization can't be made to work, we'll only have memory leaks in a load/use/unload cycle. If anyone (like, say, the OS vendor) complains about this, they can tell us how to get a shared library finalization function invoked automatically. Currently there's --disable-delayed-initialization for preventing the initialization from being delayed on UNIX, but that's mainly just for testing the linker options for initialization, and will probably be removed at some point. */ /* Helper macros. */ # define JOIN__2_2(A,B) A ## _ ## _ ## B # define JOIN__2(A,B) JOIN__2_2(A,B) /* XXX Should test USE_LINKER_INIT_OPTION early, and if it's set, always provide a function by the expected name, even if we're delaying initialization. */ #if defined(DELAY_INITIALIZER) /* Run the initialization code during program execution, at the latest possible moment. This means multiple threads may be active. */ # include "k5-thread.h" typedef struct { k5_once_t once; int error, did_run; void (*fn)(void); } k5_init_t; # ifdef USE_LINKER_INIT_OPTION # define MAYBE_DUMMY_INIT(NAME) \ void JOIN__2(NAME, auxinit) () { } # else # define MAYBE_DUMMY_INIT(NAME) # endif # ifdef __GNUC__ /* Do it in macro form so we get the file/line of the invocation if the assertion fails. */ # define k5_call_init_function(I) \ (__extension__ ({ \ k5_init_t *k5int_i = (I); \ int k5int_err = k5_once(&k5int_i->once, k5int_i->fn); \ (k5int_err \ ? k5int_err \ : (assert(k5int_i->did_run != 0), k5int_i->error)); \ })) # define MAYBE_DEFINE_CALLINIT_FUNCTION # else # define MAYBE_DEFINE_CALLINIT_FUNCTION \ static inline int k5_call_init_function(k5_init_t *i) \ { \ int err; \ err = k5_once(&i->once, i->fn); \ if (err) \ return err; \ assert (i->did_run != 0); \ return i->error; \ } # endif # define MAKE_INIT_FUNCTION(NAME) \ static int NAME(void); \ MAYBE_DUMMY_INIT(NAME) \ /* forward declaration for use in initializer */ \ static void JOIN__2(NAME, aux) (void); \ static k5_init_t JOIN__2(NAME, once) = \ { K5_ONCE_INIT, 0, 0, JOIN__2(NAME, aux) }; \ MAYBE_DEFINE_CALLINIT_FUNCTION \ static void JOIN__2(NAME, aux) (void) \ { \ JOIN__2(NAME, once).did_run = 1; \ JOIN__2(NAME, once).error = NAME(); \ } \ /* so ';' following macro use won't get error */ \ static int NAME(void) # define CALL_INIT_FUNCTION(NAME) \ k5_call_init_function(& JOIN__2(NAME, once)) /* This should be called in finalization only, so we shouldn't have multiple active threads mucking around in our library at this point. So ignore the once_t object and just look at the flag. XXX Could we have problems with memory coherence between processors if we don't invoke mutex/once routines? Probably not, the application code should already be coordinating things such that the library code is not in use by this point, and memory synchronization will be needed there. */ # define INITIALIZER_RAN(NAME) \ (JOIN__2(NAME, once).did_run && JOIN__2(NAME, once).error == 0) # define PROGRAM_EXITING() (0) #elif defined(__GNUC__) && !defined(_WIN32) && defined(CONSTRUCTOR_ATTR_WORKS) /* Run initializer at load time, via GCC/C++ hook magic. */ # ifdef USE_LINKER_INIT_OPTION /* Both gcc and linker option?? Favor gcc. */ # define MAYBE_DUMMY_INIT(NAME) \ void JOIN__2(NAME, auxinit) () { } # else # define MAYBE_DUMMY_INIT(NAME) # endif typedef struct { int error; unsigned char did_run; } k5_init_t; # define MAKE_INIT_FUNCTION(NAME) \ MAYBE_DUMMY_INIT(NAME) \ static k5_init_t JOIN__2(NAME, ran) \ = { 0, 2 }; \ static void JOIN__2(NAME, aux)(void) \ __attribute__((constructor)); \ static int NAME(void); \ static void JOIN__2(NAME, aux)(void) \ { \ JOIN__2(NAME, ran).error = NAME(); \ JOIN__2(NAME, ran).did_run = 3; \ } \ static int NAME(void) # define CALL_INIT_FUNCTION(NAME) \ (JOIN__2(NAME, ran).did_run == 3 \ ? JOIN__2(NAME, ran).error \ : (abort(),0)) # define INITIALIZER_RAN(NAME) (JOIN__2(NAME,ran).did_run == 3 && JOIN__2(NAME, ran).error == 0) # define PROGRAM_EXITING() (0) #elif defined(USE_LINKER_INIT_OPTION) || defined(_WIN32) /* Run initializer at load time, via linker magic, or in the case of WIN32, win_glue.c hard-coded knowledge. */ typedef struct { int error; unsigned char did_run; } k5_init_t; # define MAKE_INIT_FUNCTION(NAME) \ static k5_init_t JOIN__2(NAME, ran) \ = { 0, 2 }; \ static int NAME(void); \ void JOIN__2(NAME, auxinit)() \ { \ JOIN__2(NAME, ran).error = NAME(); \ JOIN__2(NAME, ran).did_run = 3; \ } \ static int NAME(void) # define CALL_INIT_FUNCTION(NAME) \ (JOIN__2(NAME, ran).did_run == 3 \ ? JOIN__2(NAME, ran).error \ : (abort(),0)) # define INITIALIZER_RAN(NAME) \ (JOIN__2(NAME, ran).error == 0) # define PROGRAM_EXITING() (0) #else # error "Don't know how to do load-time initializers for this configuration." # define PROGRAM_EXITING() (0) #endif #if defined(USE_LINKER_FINI_OPTION) || defined(_WIN32) /* If we're told the linker option will be used, it doesn't really matter what compiler we're using. Do it the same way regardless. */ # ifdef __hpux /* On HP-UX, we need this auxiliary function. At dynamic load or unload time (but *not* program startup and termination for link-time specified libraries), the linker-indicated function is called with a handle on the library and a flag indicating whether it's being loaded or unloaded. The "real" fini function doesn't need to be exported, so declare it static. As usual, the final declaration is just for syntactic convenience, so the top-level invocation of this macro can be followed by a semicolon. */ # include <dl.h> # define MAKE_FINI_FUNCTION(NAME) \ static void NAME(void); \ void JOIN__2(NAME, auxfini)(shl_t, int); /* silence gcc warnings */ \ void JOIN__2(NAME, auxfini)(shl_t h, int l) { if (!l) NAME(); } \ static void NAME(void) # else /* not hpux */ # define MAKE_FINI_FUNCTION(NAME) \ void NAME(void) # endif #elif defined(__GNUC__) && defined(DESTRUCTOR_ATTR_WORKS) /* If we're using gcc, if the C++ support works, the compiler should build executables and shared libraries that support the use of static constructors and destructors. The C compiler supports a function attribute that makes use of the same facility as C++. XXX How do we know if the C++ support actually works? */ # define MAKE_FINI_FUNCTION(NAME) \ static void NAME(void) __attribute__((destructor)) #elif !defined(SHARED) /* In this case, we just don't care about finalization. The code will still define the function, but we won't do anything with it. Annoying: This may generate unused-function warnings. */ # define MAKE_FINI_FUNCTION(NAME) \ static void NAME(void) #else # error "Don't know how to do unload-time finalization for this configuration." #endif /* 64-bit support: krb5_ui_8 and krb5_int64. This should move to krb5.h eventually, but without the namespace pollution from the autoconf macros. */ #if defined(HAVE_STDINT_H) || defined(HAVE_INTTYPES_H) # ifdef HAVE_STDINT_H # include <stdint.h> # endif # ifdef HAVE_INTTYPES_H # include <inttypes.h> # endif # define INT64_TYPE int64_t # define UINT64_TYPE uint64_t #elif defined(_WIN32) # define INT64_TYPE signed __int64 # define UINT64_TYPE unsigned __int64 #else /* not Windows, and neither stdint.h nor inttypes.h */ # define INT64_TYPE signed long long # define UINT64_TYPE unsigned long long #endif #include <limits.h> #ifndef SIZE_MAX # define SIZE_MAX ((size_t)((size_t)0 - 1)) #endif /* Read and write integer values as (unaligned) octet strings in specific byte orders. Add per-platform optimizations as needed. */ #if HAVE_ENDIAN_H # include <endian.h> #elif HAVE_MACHINE_ENDIAN_H # include <machine/endian.h> #endif /* Check for BIG/LITTLE_ENDIAN macros. If exactly one is defined, use it. If both are defined, then BYTE_ORDER should be defined and match one of them. Try those symbols, then try again with an underscore prefix. */ #if defined(BIG_ENDIAN) && defined(LITTLE_ENDIAN) # if BYTE_ORDER == BIG_ENDIAN # define K5_BE # endif # if BYTE_ORDER == LITTLE_ENDIAN # define K5_LE # endif #elif defined(BIG_ENDIAN) # define K5_BE #elif defined(LITTLE_ENDIAN) # define K5_LE #elif defined(_BIG_ENDIAN) && defined(_LITTLE_ENDIAN) # if _BYTE_ORDER == _BIG_ENDIAN # define K5_BE # endif # if _BYTE_ORDER == _LITTLE_ENDIAN # define K5_LE # endif #elif defined(_BIG_ENDIAN) # define K5_BE #elif defined(_LITTLE_ENDIAN) # define K5_LE #endif #if !defined(K5_BE) && !defined(K5_LE) /* Look for some architectures we know about. MIPS can use either byte order, but the preprocessor tells us which mode we're compiling for. The GCC config files indicate that variants of Alpha and IA64 might be out there with both byte orders, but until we encounter the "wrong" ones in the real world, just go with the default (unless there are cpp predefines to help us there too). As far as I know, only PDP11 and ARM (which we don't handle here) have strange byte orders where an 8-byte value isn't laid out as either 12345678 or 87654321. */ # if defined(__i386__) || defined(_MIPSEL) || defined(__alpha__) || defined(__ia64__) # define K5_LE # endif # if defined(__hppa__) || defined(__rs6000__) || defined(__sparc__) || defined(_MIPSEB) || defined(__m68k__) || defined(__sparc64__) || defined(__ppc__) || defined(__ppc64__) # define K5_BE # endif #endif #if defined(K5_BE) && defined(K5_LE) # error "oops, check the byte order macros" #endif /* Optimize for GCC on platforms with known byte orders. GCC's packed structures can be written to with any alignment; the compiler will use byte operations, unaligned-word operations, or normal memory ops as appropriate for the architecture. This assumes the availability of uint##_t types, which should work on most of our platforms except Windows, where we're not using GCC. */ #ifdef __GNUC__ # define PUT(SIZE,PTR,VAL) (((struct { uint##SIZE##_t i; } __attribute__((packed)) *)(PTR))->i = (VAL)) # define GET(SIZE,PTR) (((const struct { uint##SIZE##_t i; } __attribute__((packed)) *)(PTR))->i) # define PUTSWAPPED(SIZE,PTR,VAL) PUT(SIZE,PTR,SWAP##SIZE(VAL)) # define GETSWAPPED(SIZE,PTR) SWAP##SIZE(GET(SIZE,PTR)) #endif /* To do: Define SWAP16, SWAP32, SWAP64 macros to byte-swap values with the indicated numbers of bits. Linux: byteswap.h, bswap_16 etc. Solaris 10: none Mac OS X: machine/endian.h or byte_order.h, NXSwap{Short,Int,LongLong} NetBSD: sys/bswap.h, bswap16 etc. */ #if defined(HAVE_BYTESWAP_H) && defined(HAVE_BSWAP_16) # include <byteswap.h> # define SWAP16 bswap_16 # define SWAP32 bswap_32 # ifdef HAVE_BSWAP_64 # define SWAP64 bswap_64 # endif #endif static inline void store_16_be (unsigned int val, unsigned char *p) { #if defined(__GNUC__) && defined(K5_BE) PUT(16,p,val); #elif defined(__GNUC__) && defined(K5_LE) && defined(SWAP16) PUTSWAPPED(16,p,val); #else p[0] = (val >> 8) & 0xff; p[1] = (val ) & 0xff; #endif } static inline void store_32_be (unsigned int val, unsigned char *p) { #if defined(__GNUC__) && defined(K5_BE) PUT(32,p,val); #elif defined(__GNUC__) && defined(K5_LE) && defined(SWAP32) PUTSWAPPED(32,p,val); #else p[0] = (val >> 24) & 0xff; p[1] = (val >> 16) & 0xff; p[2] = (val >> 8) & 0xff; p[3] = (val ) & 0xff; #endif } static inline void store_64_be (UINT64_TYPE val, unsigned char *p) { #if defined(__GNUC__) && defined(K5_BE) PUT(64,p,val); #elif defined(__GNUC__) && defined(K5_LE) && defined(SWAP64) PUTSWAPPED(64,p,val); #else p[0] = (unsigned char)((val >> 56) & 0xff); p[1] = (unsigned char)((val >> 48) & 0xff); p[2] = (unsigned char)((val >> 40) & 0xff); p[3] = (unsigned char)((val >> 32) & 0xff); p[4] = (unsigned char)((val >> 24) & 0xff); p[5] = (unsigned char)((val >> 16) & 0xff); p[6] = (unsigned char)((val >> 8) & 0xff); p[7] = (unsigned char)((val ) & 0xff); #endif } static inline unsigned short load_16_be (const unsigned char *p) { #if defined(__GNUC__) && defined(K5_BE) return GET(16,p); #elif defined(__GNUC__) && defined(K5_LE) && defined(SWAP16) return GETSWAPPED(16,p); #else return (p[1] | (p[0] << 8)); #endif } static inline unsigned int load_32_be (const unsigned char *p) { #if defined(__GNUC__) && defined(K5_BE) return GET(32,p); #elif defined(__GNUC__) && defined(K5_LE) && defined(SWAP32) return GETSWAPPED(32,p); #else return (p[3] | (p[2] << 8) | ((uint32_t) p[1] << 16) | ((uint32_t) p[0] << 24)); #endif } static inline UINT64_TYPE load_64_be (const unsigned char *p) { #if defined(__GNUC__) && defined(K5_BE) return GET(64,p); #elif defined(__GNUC__) && defined(K5_LE) && defined(SWAP64) return GETSWAPPED(64,p); #else return ((UINT64_TYPE)load_32_be(p) << 32) | load_32_be(p+4); #endif } static inline void store_16_le (unsigned int val, unsigned char *p) { #if defined(__GNUC__) && defined(K5_LE) PUT(16,p,val); #elif defined(__GNUC__) && defined(K5_BE) && defined(SWAP16) PUTSWAPPED(16,p,val); #else p[1] = (val >> 8) & 0xff; p[0] = (val ) & 0xff; #endif } static inline void store_32_le (unsigned int val, unsigned char *p) { #if defined(__GNUC__) && defined(K5_LE) PUT(32,p,val); #elif defined(__GNUC__) && defined(K5_BE) && defined(SWAP32) PUTSWAPPED(32,p,val); #else p[3] = (val >> 24) & 0xff; p[2] = (val >> 16) & 0xff; p[1] = (val >> 8) & 0xff; p[0] = (val ) & 0xff; #endif } static inline void store_64_le (UINT64_TYPE val, unsigned char *p) { #if defined(__GNUC__) && defined(K5_LE) PUT(64,p,val); #elif defined(__GNUC__) && defined(K5_BE) && defined(SWAP64) PUTSWAPPED(64,p,val); #else p[7] = (unsigned char)((val >> 56) & 0xff); p[6] = (unsigned char)((val >> 48) & 0xff); p[5] = (unsigned char)((val >> 40) & 0xff); p[4] = (unsigned char)((val >> 32) & 0xff); p[3] = (unsigned char)((val >> 24) & 0xff); p[2] = (unsigned char)((val >> 16) & 0xff); p[1] = (unsigned char)((val >> 8) & 0xff); p[0] = (unsigned char)((val ) & 0xff); #endif } static inline unsigned short load_16_le (const unsigned char *p) { #if defined(__GNUC__) && defined(K5_LE) return GET(16,p); #elif defined(__GNUC__) && defined(K5_BE) && defined(SWAP16) return GETSWAPPED(16,p); #else return (p[0] | (p[1] << 8)); #endif } static inline unsigned int load_32_le (const unsigned char *p) { #if defined(__GNUC__) && defined(K5_LE) return GET(32,p); #elif defined(__GNUC__) && defined(K5_BE) && defined(SWAP32) return GETSWAPPED(32,p); #else return (p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24)); #endif } static inline UINT64_TYPE load_64_le (const unsigned char *p) { #if defined(__GNUC__) && defined(K5_LE) return GET(64,p); #elif defined(__GNUC__) && defined(K5_BE) && defined(SWAP64) return GETSWAPPED(64,p); #else return ((UINT64_TYPE)load_32_le(p+4) << 32) | load_32_le(p); #endif } /* Make the interfaces to getpwnam and getpwuid consistent. Model the wrappers on the POSIX thread-safe versions, but use the unsafe system versions if the safe ones don't exist or we can't figure out their interfaces. */ /* int k5_getpwnam_r(const char *, blah blah) */ #ifdef HAVE_GETPWNAM_R # ifndef GETPWNAM_R_4_ARGS /* POSIX */ # define k5_getpwnam_r(NAME, REC, BUF, BUFSIZE, OUT) \ (getpwnam_r(NAME,REC,BUF,BUFSIZE,OUT) == 0 \ ? (*(OUT) == NULL ? -1 : 0) : -1) # else /* POSIX drafts? */ # ifdef GETPWNAM_R_RETURNS_INT # define k5_getpwnam_r(NAME, REC, BUF, BUFSIZE, OUT) \ (getpwnam_r(NAME,REC,BUF,BUFSIZE) == 0 \ ? (*(OUT) = REC, 0) \ : (*(OUT) = NULL, -1)) # else # define k5_getpwnam_r(NAME, REC, BUF, BUFSIZE, OUT) \ (*(OUT) = getpwnam_r(NAME,REC,BUF,BUFSIZE), *(OUT) == NULL ? -1 : 0) # endif # endif #else /* no getpwnam_r, or can't figure out #args or return type */ /* Will get warnings about unused variables. */ # define k5_getpwnam_r(NAME, REC, BUF, BUFSIZE, OUT) \ (*(OUT) = getpwnam(NAME), *(OUT) == NULL ? -1 : 0) #endif /* int k5_getpwuid_r(uid_t, blah blah) */ #ifdef HAVE_GETPWUID_R # ifndef GETPWUID_R_4_ARGS /* POSIX */ # define k5_getpwuid_r(UID, REC, BUF, BUFSIZE, OUT) \ (getpwuid_r(UID,REC,BUF,BUFSIZE,OUT) == 0 \ ? (*(OUT) == NULL ? -1 : 0) : -1) # else /* POSIX drafts? Yes, I mean to test GETPWNAM... here. Less junk to do at configure time. */ # ifdef GETPWNAM_R_RETURNS_INT # define k5_getpwuid_r(UID, REC, BUF, BUFSIZE, OUT) \ (getpwuid_r(UID,REC,BUF,BUFSIZE) == 0 \ ? (*(OUT) = REC, 0) \ : (*(OUT) = NULL, -1)) # else # define k5_getpwuid_r(UID, REC, BUF, BUFSIZE, OUT) \ (*(OUT) = getpwuid_r(UID,REC,BUF,BUFSIZE), *(OUT) == NULL ? -1 : 0) # endif # endif #else /* no getpwuid_r, or can't figure out #args or return type */ /* Will get warnings about unused variables. */ # define k5_getpwuid_r(UID, REC, BUF, BUFSIZE, OUT) \ (*(OUT) = getpwuid(UID), *(OUT) == NULL ? -1 : 0) #endif #endif /* K5_PLATFORM_H */